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For detailed information about the contents of the and files, see A Support Guide for Wireless Diagnostics and Troubleshooting.

To obtain detailed information about the EAP authentication process, try the authentication process again and view the and files in the \Tracing folder.

For detailed information about a Windows-based authentication infrastructure, see Wireless Deployment Technology and Component Overview.

For detailed information about how to deploy a wireless LAN using IEEE 802.1X authentication, see Deployment of Protected 802.11 Networks Using Microsoft Windows.

If the wireless adapter has an Automatic Private IP Addressing (APIPA) address (169.254.0.0/16) or the configured alternate IP address, then authentication has failed and the Windows-based wireless client is still associated with the wireless AP.

If the authentication fails and the association is still in place, the wireless adapter is enabled and TCP/IP performs its normal configuration process.

For information about how to troubleshoot wireless connectivity on wireless networks that do not use 802.1X authentication, see Troubleshooting Microsoft Windows XP-based Wireless Networks in the Small Office or Home Office.

For Windows 2000, you can enable tracing in the same way to view the files in the \Tracing folder.Abstract This article describes the tools used to troubleshoot a Microsoft Windows XP or Windows Server 2003-based wireless client, a wireless access point (AP), and the Internet Authentication Service (IAS) when using Institute of Electrical and Electronic Engineers (IEEE) 802.1X authentication for IEEE 802.11-based wireless connections.This article also describes the most common problems with IAS authentication and authorization, certificate properties, and the process of certificate validation for both wireless client and IAS server certificates.Within the Network Connections folder, the text under the name of the connection corresponding to the wireless network adapter indicates the status of the connection.Figure 1 shows the information available for a wireless connection in the Windows XP Network Connections folder.

For general troubleshooting of Windows XP wireless client issues, see Microsoft Knowledgebase article Q313242, "How to Troubleshoot Wireless Network Connections in Windows XP.” For Windows Server 2003-based wireless clients, you can use the new Wireless Monitor snap-in, which can be used to view wireless APs and wireless client event information.